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Accumulated other comprehensive income (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 348,703    
Other comprehensive income, net before reclassifications (275) $ (2,095) $ 22,058
Reclassifications before income taxes 42 (132) (1,222)
Applicable income taxes 5 16 437
Ending Balance 424,791 348,703  
Unrealized appreciation of investments, net [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 370 62,093 43,176
Reclassifications to retained earnings upon adoption of new accounting standards   (61,340)  
Other comprehensive income, net before reclassifications 160 (183) 19,826
Reclassifications before income taxes (62) (253) (1,399)
Applicable income taxes 13 53 490
Ending Balance 481 370 62,093
Foreign currency translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (4,603) (3,114) (5,268)
Reclassifications to retained earnings upon adoption of new accounting standards   (65)  
Other comprehensive income, net before reclassifications 257 (1,424) 2,151
Reclassifications before income taxes     3
Ending Balance (4,346) (4,603) (3,114)
Defined benefit pension plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (816) (420) (593)
Reclassifications to retained earnings upon adoption of new accounting standards   36  
Other comprehensive income, net before reclassifications (644) (513) 65
Reclassifications before income taxes 95 116 155
Applicable income taxes (4) (35) (47)
Ending Balance (1,369) (816) (420)
Other AOCI transactions [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 34 12 (17)
Reclassifications to retained earnings upon adoption of new accounting standards   (6)  
Other comprehensive income, net before reclassifications (48) 25 16
Reclassifications before income taxes 9 5 19
Applicable income taxes (4) (2) (6)
Ending Balance (9) 34 12
Accumulated other comprehensive income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (5,015) 58,571 37,298
Reclassifications to retained earnings upon adoption of new accounting standards   (61,375)  
Ending Balance $ (5,243) $ (5,015) $ 58,571